Compressor cooling in refrigerating apparatus



March 23, 1954 A. PHILIPF COMPRESSOR COOLING IN REFRIGERATING APPARATUSFiled Aug. 31 1950 INVENTOR. Amvemw/Q s wpp Patented Mar. 23, 1954UNITED STATES PATENT OFFICE 2,672,736" coMPREssoR COOLINGINREFRIGERATING Lawrence. A, Philipp,

Nash-Kelvinator C Detroit, Mich., assignor torporation netroit, Michal acorporation. of Maryland Applicafimr Ali'g'list li l, 1950 SeriaI No'Z1823608 3 Claims.. (Cl. 62-1174) 'I'hisinvention relates torefrigerating appara tusra-nd more particularly to dissipating heatfromsaid apparatus during'the operation thereof;

ant motor-compressor unit.

Another object of my invention is to pl'OVidGi'fol: a refrigeratingsystem installed in a refrigerator cabinet,

motor-compressor unitof a refrigerating system by placing a plurality ofL-shaped secondary refrigerating systems-inspa-ced apart relation aboutthecasing of the motor-compressor unitso as to dissipate the; heat from:the motor compresson unit-into the ambient air about said uniti-Furtherv objects and: advantages. of. the present invention. will beapparent from; the following-- olescription reference being had to theaccompany-- ingf drawings, wherein a; present invention is; clearlyshown In the drawings:

Fig..lisa schematic illustration of a refrigerating' system embo yingfeatures of my invention; Figi 2-is a'top'vie'w'ofa motbr com'pressorunit shown in Fig rangement" for motor-compressor unit; and:

Fig.= 3 is a? diagrammatic illustration of? a cabinet with the' systemdisclosed Fig. 1 installed in: said cabinet.

Referringto designates; in

the drawings; the numeral? general, a refrigerating" system whichincludes a motor-compressor unit 2 2; condenserf 24 and evaporator 26:The motor-compressor unit 22 includes a casing 30 which houses tactingrelationship with the casing 30. The comside is connected topreferredform of the During operation ofthe motor compressor unit;gaseous refrigerant is Withdrawn from the evap orator 25 through thevapor return conduit 45 where'it enters the compressor and iscompr'es'sed and discharged into conduit' dfl," which conducts thecompressed refrigerant to the condenser 24;

ithe'condenser and tensive-use.

During operation of the motor-compressor unit there is considerableheat'generated within: the casingdueto the mechanical and frictionallosses ofthe compressor and due to' electrical losses of the" electric motor'3z'.

In many instances: it is" desirable to provide: means fordissip'atingheat from the motor-compres'sor unit so: as'to prolongthelife ofth'emotor windings and; the compressor; In this connec-- tion',-. I haveprovideda pluralityof secondary-re frigerating systems 50 and,- asshown, four of preferably brazed to the Preferably; thesesystems: areL-shaped and arranged" inverted fashion with"; the vertical por tion54-.ofthe libeing securedr to the casing-arid the: horizontal leg- 56'extending outwardly away from the casing: Fins; 58 are secured to eachhori'zontallleg to aid in' dissipating heat from: the tubing. As notediniFi'g; 2, theup-pe'r partof the casing is smaller than the lower'partthereof and the upper part" is eccentrically positioned witfirespecttbthelower partrthereof; It will' be noted portion of the casing.

During operation, when the aforesaid" heatis generated within the casingand must be" dissiof the secondary refrigerating systems where the thetubing with the aid of the heat transfer surfaces provided by the fins58. This arrangement materially afiects the cooling of the upper portionof the casing so as to prevent over-heating and reduced life of motorwindings and also conducts heat away from the interior of the casing andaway from the compresor unit proper.

In addition to the above characteristics of my invention, it will benoted that the secondary systems are secured to and carried by themotorcompressor unit without the aid of additional means, so that samemay be readily removed with the compressor and originally shipped forinstallation along with the compressor.

This particular arrangement of dissipating the heat from themotor-compressor unit is also advantageous when installed in the cabinet60 of the type disclosed in Fig. 3, which cabinet may be the same asthat disclosed and described in my Patent No. 2,485,066, issued October18, 1949. This cabinet includes a food storage compartment 62 and asloping rear wall section 64. Th sloping rear Wall section 84 provides amachinery compartment 66 at the rear of said wall in which themotor-compressor unit 2.2 is located. At the rear of the machinerycompartment 66 is placed the condenser 24, which is carried by a sheetof metal member 68, which may be like the sheet metal member disclosedin the aforesaid patent, to sup port the condenser and motor-compressorunit, as disclosed and described in said patent.

With the installation of the motor-compressor unit in the angularlyshaped machinery compartment, it will be noted that the sloping orangular wall 64, together with the sheet'rnetal member 68, provides anupwardly inclined. flue so that air may enter the bottom opening of themachinery compartment 66 and pass over the motorcompressor unit andcondenser, thereby causing the heat to flow through said flue. Inaccordance with the present invention, the secondary refrigeratingsystem dissipates heat from the motor-compressor unit from various sidesof the motor-compressor unit into the angularly formed machinerycompartment or upwardly inclined flue, so as to create and induce theupward flow of air through the flue and over the motoroornpress-or unitand about the condenser.

From the foregoing it will be noted that I have provided a new andimproved arrangement for dissipating heat from a motor-compressor unit.Also, it will be noted that I have utilized this characteristic forincreasing the flow of heat throug the flue of the cabinet in which themotor-compressor unit is installed. It will also i be noted that I haveprovided this improved arrangement by the use of independent secondaryrefrigerating systems which are secured to and entirely carried by themotor-compressor unit.

Although only a preferred form of the invention has been illustrated,and that form described in detail, it will be apparent to those skilledin the art that various modifications may be made therein withoutdeparting from the spirit of the invention or from the scope of theappended claims.

I claim:

1. In refrigerating apparatus, a cabinet-having a cooling compartmentand a machinery compartment, a wall member spaced from a wall of saidcabinet in overlying relationship to said machinery compartment formingtherewith an upwardly tapering fiue to induce flow of heat away fromsaid machinery compartment, a refrigerant evaporator arranged to absorbheat from said cooling compartment, a refrigerant motor-compressor unitin said machinery compartment operatively connected to said evaporator,a refrigerant condenser operatively connected to the motor-compressorunit and to said evaporator, and a secondary refrigerating system havinga portion in thermal heat conducting relationship with saidmotor-compressor unit and a portion extending outwardly therefrom intosaid flue and terminating therein below the apex of said tapering flueto aid in inducing the flow of air through said flue and about saidcondenser and motorcompressor unit.

2. In refrigerating apparatus, a cabinet having a cooling compartmentand a machinery compartment, a wall member spaced from a wall of saidcabinet in overlying relationship to said machinery compartment formingtherewith an upwardly extending flue to induce flow of heat away fromsaid machinery compartment, a refrigerant evaporator arranged to absorbheat from said cooling compartment, a refrigerant motor-compressor unitin said machinery compartment operatively connected to said evaporator,a refrigerant condenser operatively connected to the motor-compressorunit and to said evaporator, and a secondary refrigerating system havinga portion in thermal heat conducting relationship with saidmotor-compressor unit and a portion extending outwardly therefrom intosaid flue" and terminating therein below the upper extremity of saidmachinery compartment to aid in inducing the flow of air through saidflue and about said condenser and motor-compressor unit.

3. Refrigerating apparatus comprising, a refrigerant compressor, anelectric motor connected to drive said compressor, said motor andcompressor generating heat, a casing enclosing said motor and compressorin heat conducting relationship and having a dome, a plurality ofinverted L-shaped tubes attached to the dome in heat conductingrelationship and each containing a quantity of refrigerant, saidinverted L-shaped tubes each having a vertical leg in contact only withsaid dome and each having a horizontal leg extending a distance lessthan the diameter of said dome, and means sealing opposite ends of saidtubes.

LAWRENCE A. PHILIPP.

References Cited in the file of this patent UNITED STATES PATENTS NumberName Date 1,883,921 Hull Oct. 25, 1932 1,922,091 Hull Aug. 15, 19332,250,648 Phillip July 29, 1941 2,438,114 Dennedy Mar. 23, 19482,445,988 Ayers July 27, 1948 2,484,310 Phillip Oct. 11, 1949 2,561,305Limpert et al. July 1'7, 1951

